Watson, the case is closed, but a solved mystery is precisely when the detective must guard against carelessness.
Apply the brakes, Watson. Rushing past the finish line only invites a disastrous carriage collision.
Do not chase the lost pocketwatch, Watson. Sit quietly; the thief will inevitably expose himself.
Exhaustion breeds doubt, Watson. Clear the mental fog and systematically dismantle the remaining obstacles.
Even the finest vessel leaks, Watson. Inspect the hull daily before the damp ruins the cargo.
A simple, precise chemical test, Watson, outweighs a theatrical demonstration of no substance.
Looking back in self-congratulation, Watson, only ensures you stumble blindly into the Thames.